Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(colour online) First row: typical food pictures acquired by eButton; second row: pictures after undistortion; third row: food items fitted with wire meshes. The shape model in each picture (from left to right) is a sector of cylinder, a cylinder, a cuboid, a spherical cap and an irregular shape, respectively
